JP3746864B2 - Conveyor belt serpentine alignment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a meandering alignment device for a belt for a conveyor (particularly suitable for a curve conveyor).
[0002]
[Prior art]
In a conveyor in which an endless belt is passed between a head pulley and a tail pulley and the belt is curved, the belt is supported by a trough roller to prevent the fall of a conveyed product.
[0003]
As described above, the trough roller is composed of a center roller and a pair of left and right side rollers inclined at a predetermined angle with respect to the center roller.
[0004]
By the way, if the trough-shaped roller has a fixed arrangement in which the center roller is horizontal, a phenomenon occurs in which the belt slides toward the inside of the curve due to the centripetal force due to the belt tension during the operation of the curve conveyor. .
[0005]
The centripetal force due to the conveyor tension described above differs between the start of curve conveyor operation and load operation. When the load increases, the centripetal force also increases. Therefore, there is a problem that the inner edge of the curve of the belt is detached from the side roller and the conveyed product spills out.
[0006]
The meandering of the belt occurs due to bending of the belt, one-sided cargo and deformation of the frame, etc. In the case of a curved conveyor, the belt conveyor can be curved according to the topography of the installation site, In this case, the tension is generated by overlapping the tension generated inside the belt with the operation of the conveyor and the above described conditions.
[0007]
Therefore, as a prior art in which the belt is not detached from the trough roller, there is one disclosed in Japanese Patent Application Laid-Open No. 61-174020.
[0008]
In this method, two pairs of front and rear strips with a top surface formed as a concave curved surface along the width direction of the conveyor are arranged on the conveyor frame along the length direction of the conveyor at a predetermined interval in the front and rear. Then, a pair of upper and lower strips connected via a connecting frame are engaged with a carrier roller having a pair of upper carrier stands provided at the lower portion thereof, and the upper carrier stand is set to the width of the conveyor with respect to the lower carrier stand. The belt is supported by a roller which is slidable in the direction and is supported on the upper carrier stand.
[0009]
[Problems to be solved by the invention]
According to the above configuration, the meandering correction is performed while the upper carrier stand is slid with respect to the lower carrier stand as the meandering suppression force generated by the meandering of the belt increases. When the stand is attached, if the axis of the lower carrier stand does not intersect at right angles to the belt running direction, the belt may meander. That is, if there is a slight deviation in the right-angle intersection, the belt will meander.
[0010]
For this reason, there is a problem that it takes a lot of time to mount the lower carrier stand.
[0011]
Further, as the belt meanders, a force is first applied to the upper carrier stand so that the end of the carrier stand in the belt movement direction rotates in the direction opposite to the belt traveling direction, and then the side edge of the belt is applied to the side contact roller. When pressed, a force is applied to rotate in the reverse direction (the belt moving direction end of the carrier stand is the belt traveling direction).
[0012]
Then, the engaging surface of the carrier roller is strongly pressed against the lower carrier stand, and the upper carrier stand does not slide smoothly with respect to the lower carrier stand.
[0013]
For this reason, there is a problem that the initial operation of the meander correction is delayed and the meandering cannot be corrected immediately.
[0014]
Furthermore, when the operation is performed with an empty belt, the unit weight of the belt is too light with respect to fluctuations in belt tension, and correction of the belt meandering is very difficult. In particular, when the belt surface gets wet during rain or the like, the belt slips on the center roller and side rollers, and the effect of correcting meandering is low.
[0015]
In particular, when the radius of the curve is very small or the conveyor is very rough, the side edge of the belt moves from the side roller located inside the curve as the belt slides inward. There was also an inconvenience that was far off.
[0016]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to ensure smooth movement of the roller stand, to reliably and quickly give rotation (displacement) in the meandering correction direction of the roller stand, and to prevent the side edge portion on the inner side of the belt curve. It is designed not to come off the roller.
[0017]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms a roller-like frame in the conveyor in which a plurality of rollers are supported on a roller stand and the belt of the belt conveyor is supported in a bowl shape by each roller. Then, the center of the top side of the roller stand is suspended from the conveyor frame so as to be pivotable and swingable, and both sides of the centering lever whose tip protrudes in the belt running direction at the center of the lower side of the roller stand. The terminal is attached to the conveyor frame so as to be pivotable and swingable by appropriate means, and the tip of the alignment lever is attached to the conveyor frame so as to be pivotable and swingable. Uses a structure with a hitting roller.
[0018]
In the curve conveyor, a configuration in which an auxiliary roller is provided at the inner end of the curve of the roller stand or a configuration in which length adjusting devices are provided on both sides of the alignment lever are employed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.
[0020]
In the embodiment of the present invention, as shown in FIGS. 1 to 3, a plurality of rollers 2 are supported on a frame-shaped roller stand 1, and each of the rollers 2 causes a belt a of a belt conveyor A to have a bowl shape. It is supported by.
[0021]
In the illustrated case, the roller 2 includes a center roller and a pair of side rollers that are inclined with respect to the center roller (inclined so that the outer end is higher than the inner end). The number is not limited to three. In short, the conveyed product on the belt a is not spilled during conveyance.
[0022]
The frame shape of the roller stand 1 is not limited to the illustrated diamond shape, and may be a square shape or the like.
[0023]
Further, the roller stand 1 is suspended from the conveyor frame 3 of the conveyor A so that the center of the upper side of the roller stand 1 can swing and swing.
[0024]
In the illustrated case, the suspending means is pivotably and swingably attached via the ball joint 4, but may be suspended pivotally and swingably via a joint (metal fitting) other than the ball joint.
[0025]
Further, a contact roller 5 facing the side edge of the belt a is provided on both sides of the roller stand 1.
[0026]
Further, the both ends of a flat V-shaped aligning lever 6 whose tip is directed to the running direction of the belt a are rotatably attached to the center of the lower side of the roller stand 1, and the leading end of the aligning lever 6 is attached to the conveyor frame 3. It is rotatably attached to a horizontally placed bar member 7.
[0027]
In the illustrated case, the centering lever 6 can be pivoted and pivoted by using a ball joint 8, but instead of the ball joint, for example, a long hole, a large-diameter hole and a pin can be engaged. In some cases, it may be pivotably and swingably mounted.
[0028]
Now, when the curve conveyor A is activated, the tension of the carrier side belt a increases, and the belt a tries to move inward (to the right in FIG. 4) by the centripetal force due to the belt tension. That is, the center of the belt a (bisected position between both side edges) deviates from the center of the roller stand 1 (bisected position between both side edges).
[0029]
At this time, a frictional force due to meandering of the belt a is generated in the roller stand 1 via the center roller 2 and the pair of side rollers 2 that are in contact with the belt a, and acts on the center roller 2 and the pair of side rollers 2. For this reason, the roller stand 1 is turned by being counterclockwise rotated in FIG. 2 around the suspended ball joint 4.
[0030]
Furthermore, the belt tension differs depending on the weight of the conveyed product. The greater the conveyed product, the greater the belt tension. The belt tension and the centripetal force correlate, so when the centripetal force increases, the belt a moves toward the inside of the curve. The roller stand 1 tilts about the ball joint 4 and increases in inclination while following the movement, and the meandering of the belt a increases.
[0031]
However, when the side edge of the belt a hits the contact roller 5 by this meandering and the contact roller 5 is pushed up by the belt a, the roller stand 1 is swung around the ball joint 4 (as shown in FIG. 5). While pushing away (the center of the belt a deviates from the center of the conveyor frame 3), the belt centripetal force is displaced.
[0032]
At this time, the centering lever 6 rotates around the pivotable mounting portion (ball joint 8) between the bar member 7 and the tip of the centering lever 6 as the roller stand 1 is swung to the right. The roller stand 1 is forcibly swiveled (from the state shown in FIG. 2 to the state shown in FIG. 4) around the ball joint 4 so that the end of the belt 1 of the stand 1 in the offset direction protrudes in the running direction of the belt a. Of course, the opposite side of the end of the roller stand 1 on the side of the belt a is pushed away by the alignment lever 6 in the direction opposite to the running direction of the belt a.
[0033]
Then, the effect | action which approaches the belt a to the opposite direction of meandering generate | occur | produces.
[0034]
At this time, as the offset direction end of the belt a of the roller stand 1 jumps out in the running direction of the belt a, the roller 2 on the protruding end side is inclined forward, so that the belt a is quickly moved in the direction opposite to meandering. Becomes prominent.
[0035]
Of course, as the center of the belt a returns toward the center of the conveyor frame 3, the alignment lever 6 shown in FIG. 4 returns to the position shown in FIG. 2 (the roller stand 1 naturally turns back).
[0036]
In the second embodiment of the present invention, as shown in FIGS. 6 and 7, when the radius of the curve of the curve conveyor A is very small, or when the curve is very rough, the roller An auxiliary roller 2 ′ that is inclined obliquely upward (inclined) from the side roller 2 is provided at the curve inner end of the stand 1.
[0037]
Then, even if the side edge part inside the curve of the belt a accompanying the sliding movement of the belt a is detached from the roller 2, it is supported by the auxiliary roller 2 'as shown in FIG. The roller stand 1 that pulls the belt a in the opposite direction can be smoothly and accurately forcedly swung, and stable running of the belt a can be ensured.
[0038]
Of course, the contact roller 5 inside the curve is arranged outside the auxiliary roller 2 '.
[0039]
In the third embodiment of the present invention, appropriate length (extension / contraction) adjusting devices 21 are provided on both sides of the alignment lever 6.
[0040]
Although the above-described length adjusting device 21 uses a turnbuckle in the illustrated case, the opposing end portions are overlapped vertically, and a long hole is provided in both the overlapping holes or one through hole and the other in the overlapping portion. Alternatively, a method in which a fastening tool composed of a bolt and a nut is inserted into the matching hole may be adopted.
[0041]
Then, if tension is applied to the belt a before the operation of the conveyor, the correction in the case where the belt does not run in a fixed position due to a small radius of the curve or a case where the conveyor is undulating is performed. One extension is performed by contraction of the other.
[0042]
【The invention's effect】
As described above, according to the belt meandering alignment device according to the present invention, the center of the roller stand is pivotably and swingably suspended, and the alignment lever is freely rotatable between the roller stand and the bar material of the conveyor frame. The roller stand smoothly turns and swings with meandering, and the belt stand is forcibly turned with the alignment lever to correct the belt meandering to prevent spillage. It has the effect of ensuring the meandering correction by making the action respond instantaneously.
[0043]
Further, by supporting the side edge portion of the belt inside the belt by the auxiliary roller, it is possible to smoothly and accurately carry out the stable running of the belt and the forced turning of the roller stand (in the meandering correction direction).
[0044]
Further, the length adjustment device can adjust the lengths on both sides of the aligning lever to correct for various factors.
[Brief description of the drawings]
1 is a longitudinal front view of a meandering alignment apparatus according to the present invention. FIG. 2 is a plan view. FIG. 3 is a side view. FIG. 4 is a plan view of a meander correcting action. 6] Plan view of curve conveyor [Fig. 7] Front view of roller stand with auxiliary rollers [Fig. 8] Action diagram of meander correction [Explanation of symbols]
A Belt conveyor a Belt 1 Roller stand 2 Roller 2 'Auxiliary roller 3 Conveyor frames 4, 8 Ball joint 5 Roller 6 Centering lever 7 Bar material 21 Length adjusting device

Claims (3)

In a conveyor in which a plurality of rollers are supported on a roller stand and the belt of the belt conveyor is supported in a bowl shape by each roller, the roller stand is formed in a frame shape, and the center of the top side of the roller stand is a conveyor frame. At the center of the lower side of the roller stand, both ends of the centering lever protruding in the running direction of the belt are attached so as to be swivelable and swingable by appropriate means. In addition, for the conveyor, the tip of the alignment lever is attached to the conveyor frame so as to be pivotable and swingable by appropriate means, and contact rollers facing the side edges of the belt are provided on both sides of the roller stand. Belt meandering alignment device. Provided with an auxiliary roller for supporting the side edges of the belt which moves sliding the curve inner end of the roller stand, the conveyor belt meandering according to claim 1, characterized in that a per roller belt side edge on the outside Alignment device. The belt meandering alignment device for a conveyor belt according to claim 1 or 2, wherein appropriate length adjusting devices are provided on both sides of the alignment lever.

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